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U.S. Secretary of State Rex Tillerson meets with the Emir of Qatar, Sheikh Tamim Bin Hamad Al Thani at the Sea Palace, in Doha, Qatar, Tuesday, July 11, 2017. Tillerson arrived in Qatar as he tries to mediate a dispute between the energy-rich country and its Gulf neighbors. The visit is Tillerson's second stop on a shuttle-diplomacy tour that is also expected to take him to Saudi Arabia, which shares Qatar's only land border and is the most powerful of the four countries lined up against it.(Alexander W. Riedel/US State Department via AP)

Qatar has hired a Washington influence firm founded by former top campaign aides to President Donald Trump and another specialized in digging up dirt on U.S. politicians, signaling it wants to challenge Saudi Arabia's massive lobbying efforts in America's capital amid a diplomatic dispute among Arab nations.

Hiring a firm once associated with former Trump campaign manager Corey Lewandowski, who left it in May over a dispute with his partners, shows Qatar wants access to a White House with close ties to Saudi Arabia. The firm retains Barry Bennett, a Trump campaign adviser, as well as others with ties to the president.

But matching Saudi Arabia, which scored a diplomatic coup by hosting Trump's first overseas trip, could be a tough battle for Qatar, even if it does boast the world's highest per-capita income due to its natural gas deposits.

"The Qataris are belatedly working up to the scale of the challenge they face," said Kristian Coates Ulrichsen, a research fellow at the James A. Baker III Institute for Public Policy at Rice University who lives in Seattle. "This whole crisis, now that it's kind of settled down into a prolonged confrontation or standoff, it's become almost a struggle to win the hearts and minds in D.C."

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The Gulf rift already has seen slogan-plastered taxicabs in London, television attack ads in the United States and competing messages flooding the internet and state-linked media on both sides since the crisis began on June 5.

Qatar, in the midst of building stadiums for the 2022 FIFA World Cup, isn't afraid to spend its money. Since the crisis began, Qatar paid $2.5 million to the law firm of former U.S. Attorney General John Ashcroft to audit its efforts at stopping terrorism funding — one of the allegations levied by the Saudi-led quartet of nations.

According to documents newly filed to the U.S. Justice Department, Qatar has hired Avenue Strategies Global for $150,000 a month to "provide research, government relations and strategic consulting services." The contract also says that activity "may include communications with members of Congress and Congressional staff, executive branch officials, the media and other individuals."

Lewandowski founded Avenue Strategies just after the November election that put Trump in the White House. Lewandowski resigned from the firm only months later, saying he was troubled by a firm-related project he hadn't sanctioned. Others tied to Avenue Strategies had started a firm of their own, pitching Eastern European clients with promises of access to Trump and high-ranking White House officials.

The firm, which includes a former chief of staff to Israeli Prime Minister Benjamin Netanyahu , did not respond to requests for comment from The Associated Press.

Qatar also signed a three-month, $1.1 million renewable contract with the opposition research firm Information Management Services, according to a Justice Department filing .

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The firm, run by Jeff Klueter, a former researcher for the Democratic Congressional Campaign Committee, did not respond to requests for comment. It advertises itself as doing so-called "oppo," which includes digging into political opponents' past and comments for incriminating or simply embarrassing material.

Qatar did not respond to a request for comment about the lobbying contracts. But it may serve as recognition that while Qatar has had success in speaking with the State Department and the Pentagon, it needs to make inroads to the Trump White House, Ulrichsen said.

Despite hosting a major U.S. military base, Qatar has been a target of Trump over its alleged funding of extremists, something Doha denies. Saudi Arabia enjoys close relations to Trump, as well as his son-in-law Jared Kushner.

In Washington, Saudi Arabia spends millions of dollars on lobbying, including a most-recent push to oppose a law allowing Sept. 11 victims' families to sue the ultraconservative Muslim nation in U.S. courts . Its lobbying firms have been putting out memos on Qatar.

Meanwhile, an organization called the Saudi American Public Relation Affairs Committee launched an online campaign called the Qatar Insider highlighting material critical of Doha. The committee also paid $138,000 to air an anti-Qatar attack ad on a local Washington television station, according to the Qatar-funded satellite news network Al-Jazeera.

"Our aim is to show the American people that Qatar has been employing a foreign policy that harms its neighbors and contributes to regional instability," said Reem Daffa, the executive director of the committee, known by the acronym SAPRAC.

But while Daffa said SAPRAC does no lobbying, it has registered as a lobbying firm with Congress and tweeted a Qatar attack ad at Trump . It also has not filed paperwork with the Justice Department despite the committee being listed as entirely owned by a Saudi national .

The Foreign Agents Registration Act, first put in place over concerns about Nazi propagandists operating in the U.S. ahead of World War II, requires those working on behalf of other countries or their citizens to file regular reports to the Justice Department.

There are no similar rules in Britain, though the crisis recently could be seen on the streets of London. Pro-Qatar ads appeared on the city's famous black taxis, bearing the message: "Lift the Blockade Against the People of Qatar." Al-Jazeera Arabic even did a story about them.

"The prevailing view is that there are no perfect allies," recently wrote Steven A. Cook, a senior fellow with the Council on Foreign Relations. "So whatever money the Gulf countries are spending in Washington, they should know it is not very well spent."

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